Manufacturing of key equipment for maleic anhydride production technology
Maleic anhydride is one of the three major acid anhydride raw materials in the world (acetic anhydride, maleic anhydride, phthalic anhydride), and its downstream products have a wide range of development and application prospects, which can be used in synthetic resins, coatings, pesticides, lubricant additives, medicine, and paper Treatment agents, food additives, stabilizers, etc. At present, maleic anhydride production technologies mainly include butane process and benzene process. At present, the production capacity of maleic anhydride in my country is dominated by the traditional benzene process, but with the advancement of the utilization of carbon four resources, the butane process maleic anhydride plant has gradually formed a scale. Ruihua maleic anhydride technology uses n-butane as raw material to produce maleic anhydride by reacting with air. The oxidation reaction is a strongly exothermic reaction, and the heat of reaction needs to be removed during the reaction process, so the maleic anhydride device can output a large amount of steam to the outside. Because of this feature, the maleic anhydride device is suitable for joint installation with some devices with high steam consumption, such as the ethyl styrene styrene device, which can achieve the purpose of steam complementation and improve the economic efficiency of the two devices. Compared with traditional benzene maleic anhydride technology, RHMA technology can completely eliminate benzene's environmental pollution, high maleic anhydride yield, low energy consumption, high steam output, and long operation cycle of the device.
The oxidation reactor developed by Ruikai Chemical Equipment aims at the problems of the axial tube fixed-bed reactor used in the production of maleic anhydride in the industry, and proposes a multi-layer gas distributor with a central guide cone or/ And a new type of reactor with outlet rectifier and vortex breaker with a central deflector cone to form a uniform flow field and eliminate the reflux zone, thereby solving the long-term retention of reactants and reaction products and eliminating undesired side effects. The problem of reaction, while improving the safety of the reactor and improving the energy-saving effect.
The equipment is shown below:
The oxidation reactor is installed at the site of the n-butane deep processing industrial chain project of Luoyang Refining and Chemical Jiuyuan Petrochemical Co., Ltd., and its supporting supply equipment: molten salt cooler, electric heater, molten salt pump, molten salt valve, rupture disc are all installed After being delivered in place, the device was officially put into operation in September 2020. According to calculations by relevant personnel in the process department, the reaction yield of maleic anhydride has been significantly increased, and the unit consumption of butane, the raw material for maleic anhydride, has dropped from 1.1 to 1.05t. Butane/t maleic anhydride. The 40,000-ton/year maleic anhydride unit of the project is currently operating stably, and the raw material cost alone will save ~8 million yuan each year. At the same time, the oxidizer "tail-burning phenomenon" did not occur again, which is the first time that this situation has been avoided in the domestic maleic anhydride plant.
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